After a couple of hours going crazy I have managed to work out how it does actually work. Would have been a bit easier with a couple of paragraphs of instruction on the purchase item page though!!!!!!!!

How do you prevent it displaying unpublished items? I have looked but cannot find a setting to do this. I have several items that I put into my shop at intervals such as courses but do not want to delete them and yet do not want them in the price list.
As this is such a basic requirement I cannot believe that it puts these in and it must be something I am doing wrong? Please help.

Just a suggestion but would it not be better to build a generate PDF option into Generate price list?
I know it would do you out of 32 eur but then it is a further tax and money transfer so to you customer approx 42 Eur. But it would create better relations with you customers.
I have already spent over 144Eur in extensions one of which is pretty useless. This is the backup because it does not back up client information which is probably the most important! And the generic Joomla log in information does not hold important information such as addresses, postal addresses etc.
So is rapidly becoming an expensive enterprise.